CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Product	$ 231,650	$ 223,502	$ 445,403	$ 425,515
Service	124,671	119,205	247,878	235,831
Total revenues	356,321	342,707	693,281	661,346
Cost of revenues:
Product	127,147	138,805	252,629	256,238
Service	76,053	70,593	150,279	138,874
Total cost of revenues	203,200	209,398	402,908	395,112
Gross Profit	153,121	133,309	290,373	266,234
Operating expenses:
Selling, general, and administrative	81,040	76,652	160,814	153,661
Research and development	9,852	8,915	19,164	17,672
Restructuring expenses	(48)	99	(184)	357
Total operating expenses	90,844	85,666	179,794	171,690
Income (loss) from operations	62,277	47,643	110,579	94,544
Non-operating expenses, net:
Interest expense	3,406	3,081	6,379	6,078
Interest income and miscellaneous expense	(31)	(682)	(291)	(575)
Total non-operating expenses, net	3,375	2,399	6,088	5,503
Income (loss) before income tax expense (benefit)	58,902	45,244	104,491	89,041
Income tax expense (benefit)	18,757	15,680	33,992	30,746
Net (loss) income	$ 40,145	$ 29,564	$ 70,499	$ 58,295
Net income (loss) per common share
Basic	$ 0.69	$ 0.50	$ 1.21	$ 0.99
Diluted	$ 0.68	$ 0.50	$ 1.20	$ 0.98
Cash dividends declared per common share outstanding	$ 0.19	$ 0.17	$ 0.36	$ 0.32